The way Obi-Wan told it in Jedi it sounded like there was this long decline, Obi-Wan spent a lot of time trying to reach out to Vader as he got worse and worse until eventually he just lost all faith that the man he once knew and loved even existed, it was like an addiction.

So you had expectations and the Prequels didn't go like you had anticipated.

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Vader even references the addictive aspect when he somberly says "it's too late for me...son" or when he says "You don't know the power of the Darkside, I must obey my master".

Nothing in RotS negates that. He fell and he was never able to go back after Padme died.

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Here Palpatine got Anakin's attention with a story about how he can save people from dying and how he knew everything his master taught him. Then he specifically says, "the power to cheat death has been lost for...".

While that is the strongest argument for Anakin's stupidity, he was so desperate that he was willing to try anything. False hopes and all that.

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Not to mention the movie was shot with Anakins primary motives being a change of heart believing the Jedi were the true evil in the galaxy (Hense the part where palpatine tells him he's fore-filled his destiny, "From my point of view the Jedi are evil", all the scenes building tension between Anakin and the Jedi, the Jedi asking him to spy on his friend). Then in reshoots and editing Lucas wanted to change Padme to the primary motive.

I think both motives were equally important to Anakin. Padme was the primary one, indeed, but the "Jedi are evil" thing (a bit too much to call them evil) served to reduce Anakin's 2nd thoughts to destroy the Order. Not mutually exclusive.